4m BPF VLNA and Relay Switches EME2-70EXP A Complete Transmit Receive Solution

4m BPF VLNA and Relay Switches EME2-70EXP A complete transmit-receive solution for 1500W transmit, and low noise receive with integrated super low-loss input bandpass filter.

QRO is made on low-loss dielectric RT/duroid® 5880 Laminates (not on FR4).

 

4m BPF VLNA and Relay Switches EME2-70EXP Appearance:

The EME2-70EXP device consists of three components:

1. 70 – 70.5 MHz High Selectivity, High Q, Low Loss RX Bandpass Filter. It is designed to suppress HF, 50MHz, FM, and 2m signals. Its characteristic is shown in the following graph. The filter itself has an extremely low attenuation of only 0.12 dB:

 

 

2. Wideband Low Noise Amplifier.

3. High Power Relays

 

Receive gain of 4m BPF VLNA and Relay Switches EME2-70EXP

1.82 MHz: < – 65 dB
7.1 MHz: < – 65 dB
14 MHz: < – 63dB
21 MHz: < – 50 dB
28 MHz: < – 43 dB
50 MHz: < – 17 dB
70 MHz: +20 dB, NF= 0.8 dB, Input RL= -15dB, IP3out >36dBm
70.5 MHz: +20 dB, NF= 0.8 dB, Input RL= -15dB, IP3out >36dBm
88 MHz: < – 11.8 dB
98 MHz: < – 27 dB
108 MHz: < – 26 dB
144 MHz: < – 26 dB
222 MHz: < – 26 dB
432 MHz: < – 19.5 dB

The characteristics of Receiving Gain can be seen in the following graphs:

 

4m VLNA and Relay Switches EME2-70EXP HF Attenuation:

 

VLNA and Relay Switches EME2-70EXP 50 MHz Attenuation:

 

4m BPF VLNA EME2-70EXP transmitting Output Return Loss:

 

Frequency:	Attenuation:	Return Loss:
65 MHz	0.02 dB	30 dB
68 MHz	0.02 dB	40 dB
70 MHz	0.015 dB	50+ dB
70.5 MHz	0.015 dB	50+ dB
76 MHz	0.02 dB	30 dB

 

Extreme Low Loss on the transmit side thanks to RT/duroid® 5880 Laminate. Less than 0.03 dB.

With Excellent Wide-band Return Loss of 70 – 75 MHz. Better than 50 dB.

Details:

Power consumption: + 12 V, 220 mA
Max. power SWR 1:1: 1500 W
Max. power SWR 1:1.5: 1000 W
Max. power SWR 1:2: 750 W
Max. power SWR 1:3: 500 W
Connectors: “N”
By order: 7/16 DIN
Outdoor version: +12 EUR

With this device, the sequencer is mandatory. To switch from receiving to transmitting, put on a sequencer 30 ms delay.

Outdoor version with IP63 protection on order.

 

EME3-70 Low Loss Bandpass Filter Low Noise Preamplifier Transmit/Receive High Power Relay Switches Block Diagram.

 

Our EME2 – EME3 complete family 8m – 23cm is here.